Which monosaccharide does not show optical isomerism?

Dihydroxyacetone

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Glyceraldehyde

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Erythrose

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Ribose

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Solution

The correct option is A Dihydroxyacetone
Dihydroxyacetone is the monosaccharide which does not show optical isomerism. A molecule is considered chiral if there exists another molecule that is of identical composition, but which is arranged in a non-superposable mirror image. The presence of an asymmetric carbon atom is often the feature that causes chirality in molecules. Dihydroxyacetone also known as glycerone, is a simple carbohydrate with formula C $_{3}$ H $_{6}$ O $_{3}$ , hence it is not chiral.

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